queue.py

class Queue:
 def __init__(self):
 self.items = []

 def is_empty(self):
 return len(self.items) == 0

 def enqueue(self, item):
 self.items.append(item)

 def dequeue(self):
 if not self.is_empty():
 return self.items.pop(0)
 else:
 print("Queue is empty")
 return None

 def peek(self):
 if not self.is_empty():
 return self.items[0]
 else:
 print("Queue is empty")
 return None

 def size(self):
 return len(self.items)

# Create a queue object
queue = Queue()

# Main loop for queue operations
while True:
 print("\nSelect operation:")
 print("1. Enqueue")
 print("2. Dequeue")
 print("3. Show elements")
 print("4. Empty the queue")
 print("5. Exit")

 choice = input("Enter your choice (1-5): ")

 if choice == '1':
 item = input("\nEnter element to enqueue: ")
 queue.enqueue(item)
 print("Element enqueued:", item)
 elif choice == '2':
 dequeued_item = queue.dequeue()
 if dequeued_item is not None:
 print("Dequeued element from the queue:", dequeued_item)
 elif choice == '3':
 print("\nElements in the queue:", queue.items)
 elif choice == '4':
 queue.items = []
 print("\nQueue emptied")
 elif choice == '5':
 print("\nExiting program")
 break
 else:
 print("\nInvalid choice. Please enter a number from 1 to 5.")